Accession Number : AD0865480

Title :   Rotating Combustion Engine Evaluation for Low Noise Level Aircraft Applications.

Descriptive Note : Final rept. 28 Apr 69-12 Jan 70,

Corporate Author : CURTISS-WRIGHT CORP WOOD-RIDGE NJ

Personal Author(s) : Berkowitz, Murray ; Hermes, Walter L. ; Lamping, Harold D.

Report Date : JAN 1970

Pagination or Media Count : 149

Abstract : Performance capability of the Rotating Combustion Engine for low noise aircraft applications was investigated. The study compared the fuel-injected RC aircraft engine in both air-cooled and liquid-cooled versions with the objective of attaining low noise levels when installed in propeller-driven aircraft. Engine sizing curves indicate the expected displacement, weight and envelope size for a required horsepower rating in both liquid and air-cooled versions. These show that advanced development liquid-cooled engines can provide smaller and lighter installations compared to the air-cooled engines as a result of both better cooling capability and lower inherent noise levels as tested. Intake and exhaust mufflers as well as a noise reducing enclosure are defined and test program recommendations made. Cooling air blower requirements for the air-cooled version are defined and estimated to need no additional noise treatment.

Descriptors :   *AIRCRAFT ENGINES, *AIRCRAFT ENGINE NOISE, INTERNAL COMBUSTION ENGINES, INTERNAL COMBUSTION ENGINE NOISE, REDUCTION, AIRCRAFT NOISE, COMPOUND ENGINES, AIR COOLED, LIQUID COOLING, PERFORMANCE(ENGINEERING), WEIGHT, FLIGHT TESTING, REDUCTION GEARS, AERIAL PROPELLERS, FUEL INJECTION, ENGINE MUFFLERS, EXHAUST SYSTEMS, INDUCTION SYSTEMS, BLOWERS.

Subject Categories : Aircraft
      Acoustics
      Reciprocating and Rotating Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE